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Thunderbird not downloading POP3....and then it does!

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  • 1 har dette problem
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  • Seneste svar af email39

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This is a bit strange...

Thunderbird (v91.5.1, 64-bit, Win 10 Pro) connects to my POP3 account but doesn't download anything.

If I then pause Kaspersky (Internet Security) Thunderbird then connects and downloads emails.

I then re-start (un pause) Kaspersky and....Thunderbird continues to connect to my POP3 account and download files. If I stop and re-start Thunderbird I have to go through the Pause / un-pause process again.

Kaspersky is set to NOT scan encrypted connections.

It is set to scan secure traffic in Mozilla applications using the Windows Certificate store. I have disabled this and it makes no difference. I have also tried setting it to use the Mozilla certificate and installed that into Thunderbird...and it makes no difference.

All this feels like a Kaspersky issue except for the fact that once I have paused Kaspersky, and Thunderbird connects to the POP3 account, it continue to connect after I've restarted Kaspersky.

This is a bit strange... Thunderbird (v91.5.1, 64-bit, Win 10 Pro) connects to my POP3 account but doesn't download anything. If I then pause Kaspersky (Internet Security) Thunderbird then connects and downloads emails. I then re-start (un pause) Kaspersky and....Thunderbird continues to connect to my POP3 account and download files. If I stop and re-start Thunderbird I have to go through the Pause / un-pause process again. Kaspersky is set to NOT scan encrypted connections. It is set to scan secure traffic in Mozilla applications using the Windows Certificate store. I have disabled this and it makes no difference. I have also tried setting it to use the Mozilla certificate and installed that into Thunderbird...and it makes no difference. All this feels like a Kaspersky issue ''except'' for the fact that once I have paused Kaspersky, and Thunderbird connects to the POP3 account, it continue to connect after I've restarted Kaspersky.

Alle svar (5)

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It appears that Kapersky is intercepting the initial account connection, as TB works if not hindered initially. My suggestion is to focus on Kaspersky.

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Kaspersky is probably controlling the Firewall and it is blocking Thunderbird.

Exit Thunderbird Access Firewall Thunderbird must be an allowed program in order for it to have access to internet.

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Thanks for the replies.

@Toad-Hall I'd checked that Thunderbird was a Trusted application and had deleted it from Kaspersky so that it re-recognised it (and put it into Trusted) when I started Thunderbird - didn't solve the issue.

@david Yes, almost certainly Kaspersky so I'll post on their forums the same issue.

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Just as a trial, disable your anti virus, restart Thunderbird. Does the initial mail check on startup occur?

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@Matt I tried that. Disabled Kaspersky (paused it) started Thunderbird and the POP3 connection didn't happen.

I start the POP3 connection manually as I like to see how many emails I've got as I have lots of rules to move emails to folders so I want to know how many new emails I need to find.

I manually went to download emails from the POP3 account (Kaspersky paused before I started T'Bird) and no emails downloaded.

I then clicked again to manually download emails and they did download (Kaspersky still paused).

I tried this again with Kaspersky running (manually downloading the POP3 emails); first click nothing happened, second click to manually download and they downloaded.

So perhaps not Kaspersky after all......back to Mozilla Thunderbird :-(

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